<template>
  <div class="cart">
    <Header/>
    <div class="cart-info">
      <h3 class="cart-top">购物车结算 <span>共{{course_list.length}}门课程</span></h3>
      <div class="cart-title">
        <el-row>
          <el-col :span="2">&nbsp;</el-col>
          <el-col :span="10">课程</el-col>
          <el-col :span="8">有效期</el-col>
          <el-col :span="4">价格</el-col>
        </el-row>
      </div>
      <div class="cart-item" v-for="course in course_list">
        <el-row>
          <el-col :span="2" class="checkbox">&nbsp;&nbsp;</el-col>
          <el-col :span="10" class="course-info">
            <img :src="course.course_img" alt="">
            <span class="course_name">{{course.name}}<br><span class="discount">{{course.discount_name}}</span></span>
          </el-col>
          <el-col :span="8"><span>{{course.expire_text}}</span></el-col>
          <el-col :span="4" class="course-price">
            <span class="real_price">¥{{course.real_price}}</span><br>
            <span class="original_price">原价¥{{course.original_price}}</span>
          </el-col>
        </el-row>
      </div>

      <div class="discount">
        <div id="accordion">
          <div class="coupon-box">
            <div class="icon-box">
              <span class="select-coupon">使用优惠劵：</span>
              <a class="select-icon unselect" :class="use_coupon?'is_selected':''" @click="use_coupon=!use_coupon"><img class="sign is_show_select" src="../../static/image/12.png" alt=""></a>
              <span class="coupon-num">有{{coupon_list.length}}张可用</span>
            </div>
            <p class="sum-price-wrap">商品总金额：<span class="sum-price">¥ {{total_price.toFixed(2)}}元</span></p>
          </div>
          <div id="collapseOne" v-if="use_coupon">
            <ul class="coupon-list" v-if="coupon_list.length>0">
              <li class="coupon-item" :class="selected_coupon(key,item.id)" v-for="(item,key) in coupon_list" @click="click_select_coupon(key,item.id)">
                <p class="coupon-name">{{item.coupon.name}}</p>
                <p class="coupon-condition" v-if="item.coupon.condition>0">满{{item.coupon.condition}}元可以使用</p>
                <p class="coupon-condition" v-else>没有使用限制</p>
                <p class="coupon-time start_time">开始时间：{{item.start_time.replace("T"," ")}}</p>
                <p class="coupon-time end_time">过期时间：{{item.end_time}}</p>
              </li>
            </ul>
            <div class="no-coupon" v-if="coupon_list.length<1">
              <span class="no-coupon-tips">暂无可用优惠券</span>
            </div>
          </div>
        </div>
        <div class="credit-box">
          <label class="my_el_check_box"><el-checkbox class="my_el_checkbox" v-model="use_credit"></el-checkbox></label>
          <p class="discount-num1" v-if="!use_credit">使用我的贝里</p>
          <p class="discount-num2" v-else>
            <span>总积分：{{user_credit}}，抵扣
              <el-input-number @change="handleChange"  v-model="credit" :min="0" :max="max_credit()" label="请填写积分"></el-input-number>
              ，本次花费以后，剩余{{parseInt(user_credit-credit)}}积分
            </span>
          </p>
        </div>
      </div>

      <div class="calc">
        <el-row class="pay-row">
          <el-col :span="4" class="pay-col"><span class="pay-text">支付方式：</span></el-col>
          <el-col :span="8">
            <span class="alipay" v-if="pay_type==0"><img src="../../static/image/alipay2.png" alt=""></span>
            <span class="alipay" @click="pay_type=0" v-else><img src="../../static/image/alipay.png" alt=""></span>
            <span class="alipay wechat" v-if="pay_type==1"><img src="../../static/image/wechat2.png" alt=""></span>
            <span class="alipay wechat" @click="pay_type=1" v-else><img src="../../static/image/wechat.png" alt=""></span>
          </el-col>
          <!--<el-col :span="8" class="count">实付款： <span>¥{{(real_total - credit / credit_to_money ).toFixed(2)}}</span></el-col>-->
          <el-col :span="8" class="count">实付款： <span>¥{{(real_total - credit / credit_to_money).toFixed(2)}}</span></el-col>
          <el-col :span="4" class="cart-pay"><span @click="payHander">立即支付</span></el-col>
        </el-row>
      </div>
    </div>
    <Footer/>
  </div>
</template>

<script>
  import Header from "./common/Header"
  import Footer from "./common/Footer"
  export default {
    name:"Order",
    data(){
      return {
        pay_type: 0,
        course_list: [],
        total_price: 0,     // 结算总价格
        real_total: 0,      // 经过优惠券折算或者积分折算后的总价格
        coupon_list:[],     // 当前用户拥有的优惠券列表

        use_credit: false,  // 是否使用了积分
        use_coupon: false,  // 是否使用了优惠券
        credit: 0,          // 积分
        coupon: 0,          // 优惠券ID，0表示没有使用优惠券
        user_credit: localStorage.user_credit || sessionStorage.user_credit,
        credit_to_money: localStorage.credit_to_money || sessionStorage.credit_to_money,
      }
    },
    components:{
      Header,
      Footer,
    },
    created(){
      this.token = this.check_user_login();
      this.get_cart();
      this.get_coupon();
    },
    watch:{
      // 检测coupon 被修改
      coupon(){
        this.credit = 0;
        this.calc_real_total();
      },
      use_coupon(){
        if(this.use_coupon === false){
          this.coupon = 0;
          this.real_total = this.total_price;
        }
      }
    },
    methods: {
      check_user_login(){
        let token = localStorage.user_token || sessionStorage.user_token;
        if( !token ){
          let self = this;
          this.$confirm("对不起，您尚未登录！所以请登录再使用购物车","路飞学城",{
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).then(() => {
            self.$router.push("/user/login");
          });
          return false; // 阻止js继续往下执行
        }
        return token;
      },
      get_cart(){
        // 获取购物车中要结算的商品列表
        this.$axios.get(`${this.$settings.HOST}/cart/order/`,{
          headers:{
            "Authorization": "jwt " + this.token,
          }
        }).then(response=>{
          this.course_list = response.data.course_list;
          this.total_price = response.data.total_price;
          this.real_total = response.data.total_price;
        }).catch(error=>{
          this.$message.error("对不起，当前购物车没有任何商品被勾选！");
        });
      },
      get_coupon(){
        // 获取当前用户拥有的优惠券
        this.$axios.get(`${this.$settings.HOST}/coupon/`,{
          headers:{
            "Authorization": "jwt " + this.token,
          }
        }).then(response=>{
          this.coupon_list = response.data;
        }).catch(error=>{
          this.$message.error("对不起，当前购物车没有任何商品被勾选！");
        });
      },
      selected_coupon(key, user_coupon_id){
        // 当选中优惠券时，切换优惠券的高亮显示效果
        let user_coupon = this.coupon_list[key];
        // 判断总价格是否满足优惠券的使用
        if( this.total_price < user_coupon.coupon.condition ){
          return "disable";
        }
        // 判断优惠券是否处于使用时间范围内
        let start_timestamp = parseInt(new Date(user_coupon.start_time) / 1000);
        let end_timestamp = parseInt(new Date(user_coupon.end_time) / 1000);
        let now_timestamp = parseInt(new Date() / 1000);
        if( (now_timestamp < start_timestamp) || (now_timestamp > end_timestamp) ){
          return "disable";
        }

        if( this.coupon === user_coupon_id ){
          return "active";
        }

        return "";
      },
      click_select_coupon(key, user_coupon_id){
        // 点击切换优惠券时记录本次点击的优惠券
        let user_coupon = this.coupon_list[key];
        if( this.total_price < user_coupon.coupon.condition ){
          return false;
        }

        let start_timestamp = parseInt(new Date(user_coupon.start_time) / 1000);
        let end_timestamp = parseInt(new Date(user_coupon.end_time) / 1000);
        let now_timestamp = parseInt(new Date() / 1000);
        if( (now_timestamp < start_timestamp) || (now_timestamp > end_timestamp) ){
          return false;
        }
        this.coupon = user_coupon_id;

      },
      payHander(){
        // 生成订单
        this.$axios.post(`${this.$settings.HOST}/order/`,{
          pay_type: this.pay_type,  // 支付方式
          credit: this.credit,      // 积分
          coupon: this.coupon,      // 优惠券ID
        },{
          headers:{
            "Authorization": "jwt " + this.token,
          }
        }).then(response=>{
          // 订单生成成功！
          this.$message.success("订单生成成功！即将跳转到支付页面，请不要眨眼！");
          // 发起支付[页面跳转,后端需要提供跳转地址]
          this.$axios.get(`${this.$settings.HOST}/payment/alipay/`,{
            params:{
              order_number: response.data.order_number,
            }
          }).then(response=>{
            // 返回支付链接地址
            location.href=response.data;

          }).catch(error=>{
            this.$message.error(error.response.data.message);
          })
        }).catch(error=>{
          this.$message.error("订单生成失败！");
        })
      },
      calc_real_total(){
        this.coupon_list.forEach((item)=>{
          // 选出当前选中的那一张优惠券
          if(item.id === this.coupon){
            let start_timestamp = parseInt(new Date(item.start_time) / 1000);
            let end_timestamp = parseInt(new Date(item.end_time) / 1000);
            let now_timestamp = parseInt(new Date() / 1000);
            // 选出当前可以使用的优惠券
            if( (this.total_price > item.coupon.condition) && (now_timestamp > start_timestamp) && (now_timestamp < end_timestamp) ){
              // 获取优惠公式
              let f = parseFloat( item.coupon.sale.substr(1) );
              // 根据优惠公式计算最终折算后的总价格
              if( item.coupon.sale[0] === "*" ){
                // 折扣优惠
                this.real_total = this.total_price * f;
              }else{
                // 减免优惠
                this.real_total = this.total_price - f;
              }
            }
          }
        });
      },
      max_credit(){
        // 计算本次订单中，用户可以设置的最大积分

        // 用户拥有的积分允许抵扣的最大金额
        let max_credit_to_money = this.user_credit / this.credit_to_money;
        // 计算当前真实的订单实付金额
        let ret = 0;
        if(max_credit_to_money > this.real_total){
          ret = parseInt(this.real_total * this.credit_to_money);
        }else{
          ret = parseInt(this.user_credit);
        }
        console.log(ret);
        return ret;

      },
      handleChange(value){
        if(!value){
          this.credit = 0;
        }
      }
    },
  }
</script>

<style scoped>
  .cart{
    margin-top: 80px;
  }
  .cart-info{
    overflow: hidden;
    width: 1200px;
    margin: auto;
  }
  .cart-top{
    font-size: 18px;
    color: #666;
    margin: 25px 0;
    font-weight: normal;
  }
  .cart-top span{
    font-size: 12px;
    color: #d0d0d0;
    display: inline-block;
  }
  .cart-title{
    background: #F7F7F7;
    height: 70px;
  }
  .calc{
    margin-top: 25px;
    margin-bottom: 40px;
  }

  .calc .count{
    text-align: right;
    margin-right: 10px;
    vertical-align: middle;
  }
  .calc .count span{
    font-size: 36px;
    color: #333;
  }
  .calc .cart-pay{
    margin-top: 5px;
    width: 110px;
    height: 38px;
    outline: none;
    border: none;
    color: #fff;
    line-height: 38px;
    background: #ffc210;
    border-radius: 4px;
    font-size: 16px;
    text-align: center;
    cursor: pointer;
  }
  .cart-item{
    height: 120px;
    line-height: 120px;
    margin-bottom: 30px;
  }
  .course-info img{
    width: 175px;
    height: 115px;
    margin-right: 35px;
    vertical-align: middle;
  }
  .alipay{
    display: inline-block;
    height: 48px;
  }
  .alipay img{
    height: 100%;
    width:auto;
  }

  .pay-text{
    display: block;
    text-align: right;
    height: 100%;
    line-height: 100%;
    vertical-align: middle;
    margin-top: 20px;
  }
  .course_name,.real_price,.original_price{
    display: inline-block;
    line-height: 140%;
  }
  .course_name .discount{
    color: #ffc210;
  }

  .original_price{
    color: #9b9b9b;
  }
  .course-price{
    line-height: 32px;
  }


  /** 优惠券 **/
  .coupon-box{
    text-align: left;
    padding-bottom: 22px;
    padding-left:30px;
    border-bottom: 1px solid #e8e8e8;
  }
  .coupon-box::after{
    content: "";
    display: block;
    clear: both;
  }
  .icon-box{
    float: left;
  }
  .icon-box .select-coupon{
    float: left;
    color: #666;
    font-size: 16px;
  }
  .icon-box::after{
    content:"";
    clear:both;
    display: block;
  }
  .select-icon{
    width: 20px;
    height: 20px;
    float: left;
  }
  .select-icon img{
    max-height:100%;
    max-width: 100%;
    margin-top: 2px;
    transform: rotate(-90deg);
    transition: transform .5s;
  }
  .is_show_select{
    transform: rotate(0deg)!important;
  }
  .coupon-num{
    height: 22px;
    line-height: 22px;
    padding: 0 5px;
    text-align: center;
    font-size: 12px;
    float: left;
    color: #fff;
    letter-spacing: .27px;
    background: #fa6240;
    border-radius: 2px;
    margin-left: 20px;
  }
  .sum-price-wrap{
    float: right;
    font-size: 16px;
    color: #4a4a4a;
    margin-right: 45px;
  }
  .sum-price-wrap .sum-price{
    font-size: 18px;
    color: #fa6240;
  }

  .no-coupon{
    text-align: center;
    width: 100%;
    padding: 50px 0px;
    align-items: center;
    justify-content: center; /* 文本两端对其 */
    border-bottom: 1px solid rgb(232, 232, 232);
  }
  .no-coupon-tips{
    font-size: 16px;
    color: #9b9b9b;
  }
  .credit-box{
    height: 30px;
    margin-top: 40px;
    display: flex;
    align-items: center;
    justify-content: flex-end
  }
  .my_el_check_box{
    position: relative;
  }
  .my_el_checkbox{
    margin-right: 10px;
    width: 16px;
    height: 16px;
  }
  .discount{
    overflow: hidden;
  }
  .discount-num1{
    color: #9b9b9b;
    font-size: 16px;
    margin-right: 45px;
  }
  .discount-num2{
    margin-right: 45px;
    font-size: 16px;
    color: #4a4a4a;
  }
  .sun-coupon-num{
    margin-right: 45px;
    margin-bottom:43px;
    margin-top: 40px;
    font-size: 16px;
    color: #4a4a4a;
    display: inline-block;
    float: right;
  }
  .sun-coupon-num span{
    font-size: 18px;
    color: #fa6240;
  }
  .coupon-list{
    margin: 20px 0;
  }
  .coupon-list::after{
    display: block;
    content:"";
    clear: both;
  }
  .coupon-item{
    float: left;
    margin: 15px 8px;
    width: 180px;
    height: 100px;
    padding: 5px;
    background-color: #fa3030;
    cursor: pointer;
  }
  .coupon-list .active{
    background-color: #fa9000;
  }
  .coupon-list .disable{
    cursor: not-allowed;
    background-color: #fa6060;
  }
  .coupon-condition{
    font-size: 12px;
    text-align: center;
    color: #fff;
  }
  .coupon-name{
    color: #fff;
    font-size: 24px;
    text-align: center;
  }
  .coupon-time{
    text-align: left;
    color: #fff;
    font-size: 12px;
  }
  .unselect{
    margin-left: 0px;
    transform: rotate(-90deg);
  }
  .is_selected{
    transform: rotate(-1turn)!important;
  }
</style>
